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Go to star-delta (y-delta) transformation calculator

Standard 3 phase circuit can have different topologies, but most common are star (sometimes also called Y, T or wye) and delta topology (sometimes also called triangle or pi), both given in figure bellow.


Given 3 phase network can be transformed from delta to star and vice versa. Impedances between points A and B, B and C and C and A has to be preserved. Impedances are follows:


By solving above set of equations for ZA, ZB and ZC, star-delta (y-delta) transformation is obtained, and star-delta (y-delta) transformation calculation is:


With star-delta transformation, 3 phase circuit is transformed from star to delta topology with equivalent impedance.

Go to star-delta (y-delta) transformation calculator

External links:

Delta-Star Transformation on Electrical4u
Delta-Star Transformation on Wikipedia
Delta-Star Transformation on electronics-tutorials


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